Food mixer power unit



1945 v. c. KENNEDY FOOD MIXER POWER UNIT Filed Sept. 9, 1942 3 Sheets-Sheet l g- 14, 1945- v. c. KENNEDY FOOD MIXER POWER UNIT Filed Sept. 9, 1942 5 Sheets-Sheet 2 wt R1 A \N kwQ I N V EN TOLR. Wi /ye //e /7;?

5 SheetsSheet 3 V. C. KENNEDY FOOD MIXER POWER UNIT Filed Sept. 9, 1942 Aug. 14, 1945.

NVENTOR. /7e i /y/zevj/ Patented Aug. 14, 1945 FOODMIXERPOWEBUNIT v Verne C. Kennedy, Evanaton, Ill., alsignor to Dormcyer Corporation,

tlon of Illinois Chicago, Ill., a corpora- A'epplication October 9, 1942, Serial No. 461,436 (01. 172-36) 16 Claims.

This invention relates to food mixers and more particularly to a power device employed to mount and drive a plurality of food processing tools including a single beater ora plurality oi interdigitating heaters for mixing food ingredients.

Certain features of the invention are related to and constitute improvements over the constructiondisclosed in my co-pending application, Serial No. 444,314, filedMay 25, 1942, reference to which is hereby made.

Certain other features of the invention relate more particularly to an improved power transmission and speed governor for food mixers.

One of the objects of the invention is to provide an improved trammission by which a high speed fractional horse power motor is geared down to drive, selectively or otherwise, a plurality of food processing devices whose shaft speed reduction ratios vary from -1 to 300-1 revolutions per minute.

A further object of the invention is to minimize the number of gears employed to drive any one or all of three diflerent types of processing tools.

Another object is'to provide an improved construction for a transmission employing fluid under pressure as a power transmittingmedium, and as a corollary thereto employing the power transmitting medium as a source of lubricant for the moving parts.

Another object oi the invention is to provide a transmission having a plurality of shafts therein characterized as a unitary assembly which is capable of being dismantled only under the application of heat.

Another object 01 the invention is to provide an improved centrifugal speed governor wherein a self-contained bo y 01' fluid is employed as the centriiugated element.

. A further object is to provide for an improved manner of mounting a handle upon the power unit in relationship to a power takeoff socket which is also relied upon to support a power device, and as a corollary to this object utilizing the power takeoff socket element as a means for securing in part a finishing shell over the power unit.

Another object of the invention is to provide an improved cooling system and an arrangement for fractional horse power motors wherein electrical accessories to the motor, such as the condenser, interrupter, and resistance for a speed governor are located outside the path or air passing through the motor, and along withthe transmission are mounted within a finishing shell and thereto, and the appended claims.

Referring now to the drawings,

Fig. 1 is a fragmentary sectional view in which the section is taken vertically through the longitudinal center oi a food mixer illustrating an embodiment of the present invention;

Fig. 2 is a section taken upon the line 22 in Fig. 1;

Fig. 3 is a section taken upon the line 3-4 in Fig. 1, illustrating the construction of the selector valve preferably employed in the invention;

Fig.4 is a vertical section through the transmission'portion of another embodiment of the invention;

Fig. 5 is a section taken upon the line 5-5 in Pi 4:

Fig. 6 is a vertical section illustrating another construction by which the food processing drive shafts can be mounted in place;

Fig. '7 is a section illustrating another construction in which the gear chamber is a hard metal insert in a soft metal casting, and

Fig. 8 is a section'taken upon the Fi 4.

I teierring no to the drawings in further detail, the power unit 10 is shown disposed in its working position as mounted upon the support ii to overhang a bowl l2 rotatably mounted on a turntable II. The turntable I3 is pivoted as at: It on the base I! and the lower end 01 the supline I-! of .port is rigidly secured to the base "as at i! in a suitable manner. When the unit is in its working position the heaters l'l, preierably interdigitating heaters, depend and are disposed in the bowl to agitate the contents thereof.

A handle I. is releasably secured to the power unit, as more particularly described later, and at its forward}. end conceals in mutually supporting relationship the .front end of the power takeoi! socket 211 where it extends through the shell ii for this purpose. Removal of the handle provides access to the Juicer attachment shown in phantom 22, or a meat chopper shown, in phantom 21.

\ Power nit- The power unit Iii comprises the shell 21, a prime mover, a transmission 25, the removable,

handle ll, just mentioned, a speed governor 28, and preferabl two downwardly ektending arsl.

lel flanges 11 upon the shell 2| spaced from each comprises a'stator II and a rotor or armature ll supported withrespecttoeachotherinoperative positionbyboltsil andspaoersleevesflsecured to spaced end markers-ll and as, one or which tllsapartoforissecuredtothetransmisslonll.

Belfaligningarmaturebearingstlaremounted intheendmembersandabrushholderttisalso carried by the bolts and spacers where the brushes 81 may W ite in theusual manner with thejeommutatcr IO.

nsmoreparticularlyshownlnl imitherear and member it is a stamped plate having a centralopenlngllandlaterallyspaeedopenings 4| to receive the ends of the bolts, and is provided mama perforations I! which allow for the passageofsirthroughtheendmember.

long periods of service, and where the forward is held in contact with them by the spring fingers 4| so that once the wick is saturated with oil, the lubrication of the bearing is maintained for I played at the forward end to support the motor The bearing 8| has a preferably spherical or held in place by a stamped retainer totheendmemberasat. The has spring nngers ll which hold the place and one of the spring fingers has a detent ll therein which engages in a longitudinal slot "upon the bearing to prevent relative rotation under the influence of the rotating shaft.

In addition to the bearing retainer, the rivets 46 are also employed to secure a bracket is to the and member to provide a support for the weight of the motor at the rear end thereof. This bracket is bentat its outer end at a point I. and to an angle suitable to engage and follow the contour of a supporting element which inthedevleeshownistheinnerwall ofthe shell II. Thecaslngandbraoketmaybesecuredtosetherbya machinescrew ll threaded into the bracket as at Iljand adapted to receive a rubber grommetlsforcushioningthepartsandab-' sorbing sound.

'lherivetsllalsosecuretotherearmember an air deflector ll upon the front face of the bracket to'encompass the blades of the fan it and deflect outwardly and forwardly the air coming through the openings that is propelled by thefan for circulation.

A cardboard member II is received upon the bell-shaped portion of the deflector, and the marginal edges of the cardboard engage the inside of the shell II to provide a barrier preventing circulation of air around the edge of the bell and back through the opening 42. Preferably, the cardboard is located in the housing where, meohanically speakins. if it tends to move in one direction, it wedges itself against the deflector ll, while if it moves in th opposite direction it wedges itself against the shell 2|, thereby being held rigidly in place withno further pressure .upon itthan the air whichit controls and its inherent stability. The barrier being made of cardboard. this arrangement permits assembly without rattles developing in the products also.

Referring now to the means by which the motor elements are supportedat the front end, like numerals refer toflke or identical parts to the extent that the elements correspond. The two selfallgning bearings are self lubricating. being made of porous metal and a felt wick I and transmission in the shell. It is preferred that the supports 48 and a constitute the sole support of the prime mover and transmission with the one at the front engaging the shell, preferably at spaced points, and the one at the rear engaging the shell at only one point. The rods ll upon the motor parts are supported and threaded at the front to be received in the end member 84 and project rearwardly parallel with each other, preferably in this instance, in a vertical plane. The spacers 32 comprising short sleeves, are then slipped on the rods, followed by the brush support 39, then a second set of spacers, the stator 28, then more spacers, the rear end member and upon one of the bolts an insulating member which carries the spring arms ti and 62 of the speed governor which now will be described.

Speed governor The speed governor 26 is mounted on the end of the armature shaft 63 whereit extends beyond the rear bearing 35 and comprises a centrifugally responsive device, two contacts BI and 65 by the carried spring arms BI and 82 that are mounted at spaced points upon the insulating member 60 Just mentioned, and an adjustable element it for varying the position of the arm 62 in relationship to the-arm. v

The responsive device comprises a circular plate 61 provided with radially disposed vanes 6| upon one side. Over the vanes is secured marginally, as by brazing, a cup-shaped member Hi having a flexing end wall H and a bellows type side wall 12 so that the center of the end wall and the sidewall flex independently of each other.

A spring 13 is disposed between the plate and the end wall at the axis of rotation to urge the center of the end wall away from the plate. The exposed face of the end wall receives a conical end thrust member It whose apex is disposed at the axis of rotation and engages the spring arm ii under the tension present in the spring arm and under that which is created by the spring. The conical member is held in place permanently as by brazing.

The plate is slightly concave and is provided with an opening II at the center of the concavity and a cylindrical flange II by which it is mounted upon the shaft. The space between the plate and member is filled with a liquid 11, preferably an oil, and all the air is permitted to escape through the opening It. During filling operation the spring 13 will have expanded the compartment quite measurably and after all the air is replaced with oil the assembly is placed in a form and collapsed to an exact extent to remove surplus oilfrom the compartment, after which the opening I5 is sealed.

Thereafter, when released from the form the expansion force exerted by the spring II will force the point of the member ll outwardly and collapse theside wall bellows 12 inwardly. when the device is rotated by the motor shaft the oil 11 in the compartment centrifugates to expand the side wall bellows I2 under the influence of which the end wall I is drawn inwardly at the center. The vanes 60 keep the'contents of the compartment in step with the speed of rotation of the shaft 63 and in order to accentuate their action the position of the vanes may be such that they are canted slightly from radially with the outer edge trailing a true radius. With this arrangement, as the motor speeds up the vanes will tend to force the oil outwardly and as the motor slows down the oil will overtake the vanes and be moved by them inwardly. As the motor slows down the reverse will take place, thereby inducing a relative axial movement of the bearing point in relationship to variations in the speed of the motor.

This relative movement of the bearing point is used to control the make and break of the contacts 64 and 65. The contact 65 is adjusted by the cam represented diagrammatically at 66 to vary the point in the speed curve of the motor at which a break between the contacts 64 and 65 takes place. These contacts comprise a switch connected in series with the motor windings and in parallel with a condenser I8 and a resistance 80 that cushions the electrical drop in the motor circuit when the contacts are separated and also to suppress radio interference.

The cam control 66 may be operated from outside the housing in any suitable manner and upon the housing may be printed or inscribed instructions or indices (not shown) to assist the operator in selecting the speed adjustment he or she might desire. A start and stop switch (not shown) is controlled by the same shaft as the cam to open at the low point on the speed curve of the motor. This switch may be either a separate switch or the governor contacts 64 and 65 themselves. If the governor contacts are utilized then a suitable construction upon the camwhich comes into operation at a predetermined point of rotation oi the cam will accomplish the result desired.

Brush carrier unit motor is provided which can be run or inspected upon a test block before mounting it inside of the shell.

Transmission Two forms of the transmission are illustrated. One form is shown in Figs. 1-3 wherein the transmission 20 is illustrated as fashioned of a single casting 86 in the faces of which are cast and/or machined chambers for intermeshing gears. Passages connecting the chambers are drilled through the casting to interconnect the various chambers in a predetermined manner and to "place a reservoir of liquid incircuit with the system thus provided.

The other form, Figs. 4 and 5, is one wherein the. chambers for the gearsare formed in separate bodies 06, 81 and 08, which bodies are machined separately and assembled with intercom necting tubes on a stamped metal member 2M and the complete assembly brazed by heat to form a single fabricated unit.

Figures 1-3 The transmission 25, illustrated in these ilgures, is preferably a single casting 06 of a durable metal capable of cooperating with rotating parts with minimum wear. Although a soft metal can be used, it is preferred that where a soft metal or plastic is used the chambers for the gears are preferably made of harder metal inserts 0| (Fig. 7) to be mounted and held in place by cover members 02. Where inserts are used, they are machined to receive the gears 93 and marginally ground with the gears in place to provide a close fit with the cover when the cover is secured in place against the edges of the insert.

The casting 85, shown, is one that is cored from the upper side as at 94 to provide a reservoir in and around the stock provided forvrecelv-l ing the gears and valve. Once charged with a supply of liquid 95 the reservoir issealed by acover 96 secured in place marginally by screws 91, in any other suitable manner as by swaging'.

The cover plate 96 has a small vent hole (not.

shown) to take care of expansion except where a shaft extends through it, in which case clearance around the shaft provides adequate means for venting the compartment, the vent being small enough to prevent the escape of liquid therethrough if the power unit is laid upon its side or raised to tilted position.

Lodged in the cover is a flat member 60 of aluminum, the lower end of which is submerged in the liquid 95 and the upper end located in the path of cooling air. By heat absorption from the liquid, heat conduction through the member 98 and dissipation to the air, the liquid is cooled.

A pair of gears are mounted in each cavity formed in the; wall of the casting with a close clearance provided between the teeth of the gears and the wall of the cavity. In the embodiment illustrated in Fig. 6 the cavity I00 is large enough to receive a flange IOI upon the cover I02 and support it rigidly in place against dislodgement. In this particular embodiment the compartment I03 for the gears I04 is machined in the cover member I03 itself within the confines of the flange IIII. With this arrangement, any wear of the gears or compartment which would result in a loss of power can be taken up by grinding down the flange I0 I, but whether the cover is the type shown in Fig. 6 or is a fiat one designed to rest flush with the walls of the cavity or the upper edge of an-insert a portion of the wall proximate the center of the gear upon both sides of the gear is relieved as at I05 and this relief vented to the low pressure side of the compart-' ment I03 of which the gears operate, thereby reducing leakage due to pressures developed in the operation of the system.

Beyond the compartments the wall of the casting'is preferably bored through into the reservoir 94 and so constructed as to receive a bearing sleeve I06 therein which can be burnished into place by a ball forced completely through the sleeve.

The boring for the bearing sleeve isdone either with the gears I04 in place to serve as guides or with the bores I 08 in the cover I02 serving as guides. In fact, if the covers are secured in place as where in Fig. 6 the gear compartment I03 is machined in relationship to the bores I08 therein, it is preferred that the boring operation in the casting be guided fromrthe bore I00 in the cover with boththe bearingsleeves Ill and Illa burniahedlaterinone operation, depending upon plant equipment and machining expedients.

A comparatively small compartment III is providedonthesideofthecastingwherethe motorshaftisreceivedandthecoverill forthis compartmentcanbeanindependentpartoran assembledpartidentiiiedwiththefront endmemberNinwhichthefront bearingllisreeeived, ashasalreadybeendescribed. Ifthemotorand trinsinissionconstructionwererigidthegearlif cmildbelockedtigh irinplaceupontheend ofthemotorshaftilbutitispreferredthat therebeacertainamountcfloosenessbetween thegearandthemotorshaftsimilartoauniverlalioinmtoallowforflexingoftherods. Such a Joint would include radially disposed mating surfaces similar to-the Oldham coupling which would permit relative movement within the gear by the shaft without binding if they are slightly of! center.

It will be appreciated that this universal coupling will permit wide tolerances regarding the shaft and gear being of! center if\the gear II! is iournalled in the casting 44 independently of the shaft 83. As has already been described, the rods it are threaded toengage in mutually supporting relationship the transmission as at I II whereby the prime mover and transmission comprise a unitary construction upon which the shell is secured.

Upon the bottom side the cavity H4 is substantially deeper and the gears III therein are substantially larger in diameter to provide approximately a ten to one s uct on ratio between the motor shaft speed and the shaft speed of the gears III. The gears are mounted upon sleeve shafts III and adapted to receive beater rods II'I. One of the shafts is accessible from beyond the cover plate to drive the juicer device if.

The diameter of the gears 'II! are preferably one and one-half inches so that they space the beater rods I I1 approximately that distance from each other. 'lhe blades -I II on the beater rods are as large as possible within the limits of safety to clear one another In order to rotatably support the heater shafts the housing is provided with a pair of vertical bores III spaced at right angles to the longitudinal axis of the power unit or any other angle thereto that may be desired and since both assemblies are substantially the same only one need be described in detail.

In the bores III are located the sleeve bearings Iii burnished in place by a ball, as already described. Corresponding sleeve bearings may be provided in the cover, but where the shaft is exposed it is preferred to provide a combination bearing and seal in the form of a neoprene ring If! as shown in the cover I by which the gears III are held in place. The heater shaft I24 comprises a tubular metal member upon which the gear III is secured, preferably by a pressed fit, and at Itsupper end the sleeve is provided with a plurality of longitudinal kerfs I25 cut radially at right angles to each other. The shaft terminating within the reservoir is provided with a metal can III press iltted over the end to prevent the contents of the reservoir from draining therefrom, whereas the upper end of the other shaft terminates in a bore I11 which extends on through to receive the Juicer shaft without opening into the reservoir.

With this construction the upper end of each beater rod II! is provided with a slot III for receiving a latching spring III secured in the slots by deforming the body of the rod adiacent the slot to rivet the spring in place. The upper end of the spring is free to move radially outwardly beyond the surface of the rod to engage in the her! III cut in the beater shaft sleeves.

Thus, when the beater elements have their upper ends forced into the bore of the beater shaft the end of the spring is cammed intothe slot III in the beater rod until the hump reaches registry with the kerf I" in the end ofthe shaft, whereupon itsprinss into the kerf and the beater rod III and the beater blades III are thereby retained In proper rotative position and smmorted against inadvertent dislodgement. The kerfs III in the two beater shafts are so located in relationship to the meshing of the two gears that the blades upon the beater rods mesh in proper interdigitating relationship for mixing the food ingredients. Immediately below the openings into which the beater rods are to he received in the beater shafts the finishing shell is perforated as at IJI with sutdcient clearance to permit the ready insertion and removal of the beater rods. This is also the case with the shell over the Juicer opening, see opening It! provided in the shell for receiving the Juicer support.

Upon the front side of the casting the compartment I14 provided there receives a pair of gears IlI whose diameter is as large as possible and whose depth of tooth and thickness of gear is such as to provide a speed reduction ratio of 300 to l in relation to the motor shaft speed. As in the other instances these gears are preferably mounted upon shafts I" which are fournalled in both the casting ll and the cover Ill. The gears being of such large size, it is preferred to provide a bearing Ill for one of the shafts in the cover I31 without going clear through the cover thereby eliminating the danger of fluid leaking through while the food mixer is idle. The other shaft I40 of the gear extends forwardly through an opening I in the cover, in which it is iournalled, into the flange portion 20 adapted to receive in supported relationship the hub of a low speed food processing device, such as the meat chopper indicated at 18.

The flange 20 defines a socket I42 of a cross sectional contour having flat portions upon opposite sides to mate with the correspondingly shaped hub member to prevent relativerotation between the hub and the socket.

The power shaft I40 is provided with a large cylindrical portion I43 upon which one of the gears Ill is received and the portion I44 which extends into the socket is provided with a rectangular glot I45 for engaging with the shaft of the food processing'tool.

The flange 20 extends through the outer shell 2i and at its outer end its outer surface is correspondingly flattened to engage in a mating socket I48 upon the handle it so that the handle is supported against relative rotation when fastenedinplace.

In this connection it might be well to describe the manner in which the handle is secured in place. At the rear end the handle is provided with a reduced end portion I41 received in a complementary socket I48 provided by an element I" that follows the contour of the handle and is secured at the rear end of the casing as at Ill.

With this construction the handle is brought into supporting relationship with respect to the power unit by a single unidirectional movement in which the power takeoff flange 20 engages the socket I46 and the extension I41 engages the socket I48. In this position the handle is held in place by a latch I52 the forward end I53 of which extends through the handle and the inner end of which is formed in the shape of a hook I54 to engage an ear I55 stamped from the shell member, the operation of the latching handle being more extensively described and claimed in the Behar Patent No. 2,262,912, reference to which is hereby made.

Referring to Fig. 3 a cylindrical valve compartment I60 is bored transversely into the side of the transmission to receive a spool valve I6I controlled by a shaft I62 threaded into a retainer I63. The shaft is circumferentially grooved to cooperate with a spring detent I65 mounted upon the retainer and is threaded with a plurality of threads I66 to provide rapid axial movement with slight rotary displacement. The shaft I62 extends beyond the shell 2 I where it receives a manual control I61 which can be keyed to the shaft for relative rotary displacement without axial displacement.

In the arrangement of compartments H0, H4, I34 described, and the location of the spool valve IOI mentioned, a passageway I10 can be drilled from the output side of the compartment I00 to a port III in the valve depending upon what direction the motor rotates to provide a hydraulic flow and pressure. Furthermore, passages I12 and I13 can be drilled into the valve chamber from the other compartments lI4, I34, respectively, depending upon the direction in which the driven shafts are to be rotated. The inlet I14 of the compartment I I0 is drilled into the reservoir 94 at its lowest point and the outlets I15 of .the compartments 4 and I34 are drilled to empty into the reservoir 94, as may be desired.

It is preferred that the ports controlled by the spool valve be selectively opened to the supply of fluid under pressure separately and both ends of the spool are open to the reservoir 94 to balance the spool and prevent escape of fluid, a passage I16 through the spool being provided for this purpose with the bore I60 opening into the reservoir.

Furthermore, it will be appreciated that the power takeoff gears I35 are arranged to be spaced vertically to locate the socket 20 in the center of the power unit at as high a point as possible so that maximum clearance is provided below it for receptacles. The construction by which the juicer bowl and shaft is secured in operative position upon the power unit is somewhat similar to that shown in my earlier invention already mentioned. The juicer support has a cylindrical member I80 that fits into a vertical sleeve I8I secured to the cover 96 above the beater shaft where the kerf can be engaged in drive relationship by the shaft of the reamer (not shown). The manner in which the juicer bowl received in the sleeve IBI is indicated in broken lines as being one wherein the downwardly facing end I82 upon the member I80 engages an upwardly presenting shoulder I83 (Fig. 4) upon the supporting sleeve I8I. The upper end of the supporting sleeve is cut away as at I04 to mate with and be received in an opening I32 in the shell for the mutual support of the shell and the transmission at this point.

to illustrate the embodiment of the invention represented in these figures, the gear compartments are formed in a manner somewhat similar to the construction shown in Fig. 7 wherein inserts 200, having substantially the same thickness as the gears, are used. A heavy sheet metal container MI is provided as a central member, the outer faces of which, where feasible, serve as one wall ofthe several compartments with the gears H2 and I35 and inserts 200 resting thereagainst. The other wall of each of the compartments comprises cover members similar to those already described in connection with Figures 1, 2 and 3, which cover members can be held in place by bolts but are preferably held in place by collets 203 whose edges are brazed to one or the other, or both the container and the cover members, as indicated at 204. At the bottom of the container where the gears II5 are supported, a secondary plate 205 is supplied and secured to the container to form the inner wall of the pump compartment where the container wall is not of sufficient expansion to serve for this purpose. The collet in this instance is brazed to the plate 205 at their contiguous marginal-edges. Wherever it is desirable to provide journals in the wall of the container the wall is perforated with the stock forced inwardly and expanded to provide cylindrical flanges 206 in which the bearings are received and burnished into place as already described.

The. valve compartment comprises a section 201 of a tubular stock. held in place by being brazed to the container wherever it contacts the container and by small tubes 208 which serve as conduits connecting the several compartments in the fluid circuits.

As will be seen from Figures 4 and 5 the beater drive shafts I24 extend vertically through the container to be journalled at both ends. With this construction, sufficient space is provided between them to receive part of the valve compartment for purposes of a compactness of design. The wall of the tube 201 is cut away, as at 2I0, to clear one of the shafts and with the valve member I 6| located in place before the shafts are assembled, the shafts I24 serve as end stops for the valve movement.

In order to connect the inlet of the pump gears I 2| at the lowest point in the container 20I a section of conduit 2 is provided and in order to prevent contamination of the hydraulic fluid stored in the container a suitable cover member 2I2 is provided in which the juicer support sleeve I 8| is received and secured in place as by swaging at 2I3.

In converting the assemblage of parts shown and described in connection with Figures 4, 8 and 5, all of the parts shown except the beater rods III and the motor shaft 63, but including the motor supports 3|, are located and held in their respective positions as illustrated, with rings of brazing metal disposed where brazed joints are desired, and this assemblage is placed in a brazing oven where all the parts are brought to brazing temperature. An amount of brazing metal is provided at any one point which is sufficient to provide for the joints without the metal flowing to other parts when heated.

After brazing and cooling of the transmission the container is filled with hydraulic fluid and all the gears are mechanically run-in independently for a short period of time upon the test block, after which the motor parts are assembled upon the motor supports 3I in the manner already described. Then the assembly is test run hydraulically withsuitable adjustments being made as needed, If the motor andtransmission aretobeplacedininventory theyarewrapped in paper and placed in cardboard containers as they come from the test block. On the other hand, if they are to be used immediately in a food mixer the shell, which will now be described, is assembled on them and packed for ppin Shell As more particularly described in my co-pending application the shell II is constructed preferably of two die stamped -members Ill secured together marginally by suitable means after the combined ion and motor unit are secured in place in the lower shell member, it being appreciated that the upper shell before being secured to the lower shell is slipped over the flange II and into place on the juicer support sleeve Ill before the rear end of the shell is lowered into contact with the lower shell. Suitable openings (not shown) are provided for access to the brush holders for repair and replacement of the brushes, and the control I" for the valve is located at an aperture Ill provided where the mating edges of the shell meet over the valve construction. v

The lower shell is perforated at the rear between the flanges 21 as at ill for the admission of air in a concealed way to the space behind the deflector I4 and theiower shell is also provided with outlet openings 2" at the front end to permit escape of air after it has passed over the motor to cool it.

As mentioned heretofore, it is preferred to have the motor unit mounted upon the motor shell at three points. It will be noticed that the forward points are proximate the openings Ill where the shafts pass through the shell 2 I. With the use of resilient mountings the result can be one in which the socket flange and juicer sup- P rt sleeve III are tightly held in contact with the upper shell so that there is little opportunity for a looseness to develop which would cause a rattle or unpleasant noise.

'rwo longitudinally spaced bosses Iflare provided upon each side of the support II at the top thereof to engage the in an faces of the downwardly projecting flanges '21 to prevent the flanges from sending the support and also to align the power unit longitudinally against lateral displacement. The flanges otherwise are shaped to follow the contour of the support in a manner pleasing to the eye and a pin IN is disposed transversely through the support below the bosses. The lower edges of the flanges 21 are so cut in the stamping operation as to provide a hook engagement 2!! which engages the pin, the book being an upwardly opening one at the end of a horizontal slot through which the pin is slid into place as the power unit is moved rearbring the heaters into operative position.

Operation In operation, after the reservoir has been filled to a predetermined level before the cover is installed or has been fllled through one of the Journals before thesears are secured-implace, opcrationofthe prime mover will smegma I II.

Hydraulic fluid will be drawn bythegears Ill," from the reservoirand forced through under a positive displacement pressure to the inlet port of the'valve cylinder I from which point the fluid be directed, supp y the heater or gears I II, or the power takeoff gears ill, depending upon the setting of the valve. If supplied to the beater gears the liquid under pressure rotates the meshed gears in its escape to the reservoir along the outer edge of the compartment and thereby drives the interdigitating heaters H. In event the valve is set to supply the liquid under pressure to the power takeoff gears, the same action takes place with those gears to rotate those gears at a much slower speed, since the reduction in shaft speed is accomplished in relation to the quantity of liquid supplied by the pump each revolution to the quantity of liquid necessary to displace the motor gears each revolution. Suitable liquid seals for the shafts below the level of the hydraulic fluid may be provided if desired.

Thus, from the description had and the designation of the operations performed, it will be seen that the objects and purposes mentioned and claimed herein are accomplished by the embodiment defined, and although the description has been lodged in terms somewhat specific in details for a better understanding of the embodiment illustrated, the several embodiments of the invention suggested and described will be apparout to those skilled in the art that various and further uses, modifications and changes may be made without departing from the spirit and substance of the invention, the scope of which is commensurate with the appended claims.

What is claimed is:

1. A power unit for food mixers comprising a prime mover having a, drive shaft, a transmission housing in which one end of the shaft is received, a sealed chamber in the housing having a pair of meshed gears therein, an inlet and an outlet for said chamber, a valve chamber having an inlet connected to said outlet, a plurality of outlets from said valve chamber, a valve in the valve chamber for connecting the valve chamber inlet with the outlets selectively, and a plurality of compartments having a pair oi intermeshing gears mounted therelmsaid last mentioned com partments each having an inlet therein and an outlet, and means for interconnecting the outlet in the last compartments with the inJet of the flrst mentioned chamber including a reservoir for a liquid medium.

2. In an electric motor structure, a drive shaft and a transmission driven therefrom comprising a unit having power delivering shafts upon three sides of the transmission and a power receiving shaft, a pair of intermeshing gears upon one side disposed perpendicular to the power re" ceiving shaft in a pump compartment upon one side of the unit, a pair of intermeshing gears driving one of the power delivery shafts and disposed horizontally parallel with the lower side of the unit in a motor compartment having an inlet and an outlet, a pair of gears driving another of said power delivering shafts and disposed parallel with a vertical side of the unit in a motor compartment having an inlet, a reservoir of hydraulic fluid in the unit, means for supplying said fluid to the pump compartment, and means for interconnecting the pump compartment with said inlets.

.3. .In electric motorstructure, a drive shaft and a transmission driven therefrom comprising a unit having a power receiving shaft and power delivering shafts upon a plurality of sides of the transmission, a pair of intermeshing gears upon one side disposed perpendicular to the power delivering shaft in a pump compartment time one side of the unit, a pair of intermeshing 'gge'arsj: disposed horizontally parallel with the j lower} side ,of the unit in'a motor compartment having an inlet and an euuee; a pair' of verti- 'cally spaced gears disposed parallel with a'verti- L cal side of the unit in a motor compartment having an inlet and an outlet, a reservoir of hydraulic fluid in the unit, means for supplying said fluid to the pump compartment, and means 7 for interconnecting the pump compartment with said inlets, a power shaft extending from the upper gear of said pair of vertical gears and constructed and arranged to drive'a food cutting I i. to said housing and providing a compartment having an inlet supplied by hydraulic fluid and an outlet opening, shaft means extending through said element for rotating said gears to establish a hydraulic pressure at said outlet opening, means for relieving the shaft means to the pressure of the reservoir at a point intermediate the gears and the point where said shaft means is exposed exteriorly of said element, a pair of horizontally disposed intermeshed gears, a pair of vertical shafts rotatably driven by said gears in stepped relation and so constructed and arranged as to receive food processing tools in detachable supported relation, means for driving said gears by said hydraulic fluid under pressure including a compartment sealing the gears having an inlet upon one side of the last said pair of gears.connectedto said outlet, and an outlet to the reservoir upon the other side of said last pair of gears.

5. A power unit for food mixers comprising a drive, a transmission housing having a reservoir for a hydraulic fluid, a pair of 4 meshed gears, means for mounting said gears in sealed relation in the housing including an element secured to said housing and providing a compartment having an inlet supplied by hydraulic fluid and an outlet opening, shaft means extending through said element for rotating said gears to establish a hydraulic pressure at said outlet opening, means for relieving the shaft means to the pressure of the reservoir upon the compartment side of the point where said shaft means is exposed exteriorly of said element, a pair of horizontally disposed intermeshed gears, a pair of vertical shafts rotatably driven by said gears in stepped relation and so constructed and arranged as to receive food processing tools in detachable supported relation, means for driving said gears by said hydraulic fluid under pressure including a compartment sealing the gears having an inlet upon one side of the last said pair of gears connected to said outlet, and an outlet to the reservoir upon the other side of said last pair of gears, means for venting the bearing surfaces of the last mentioned shafts interiorly. of the housing to the reservoir.

6. A power unit for food mixers comprising a prime mover having a drive shaft, a transmissionyhousinmapair of meshed gears, 'means formounting said gearslins sealedi reiation'wm-dne housing including a compartment having an inlet opening and an outlet-"opening, means for rotating the gears by the "driveshaft, means in said transmission housingincluding a closed reservoir for supplying hydraulic fluid to saidnalled in said transmission housing Iforreceiving food processing tools in detachable supported} relation, a pair of intermeshed gears for said shafts in opposite and stepped rotation, means for mounting said last pair of gears in sealed relation in the housing including a compartment having an inlet in communication with said outletv and an outlet in communication with said reservoir;

7. A power unit for food mixers comprising a prime mover having a drive shaft, a transmissiondevice including a pump housing and a motor casing, a pair of meshed gears; means for mounting said gears in sealed relation in the housing including a compartment having an inlet opening and an outlet opening, means for rotating the gears by the drive shaft, compartment means for said transmission device defining a closed reservoir for hydraulic fluid, conduit means for supplying hydraulic fluid to said inlet from the compartment, a pair of vertically disposed shafts Journalled in said casing and receiving food processing tools in detachable supported relation, a pairof intermeshed gears for driving said shafts in opposite and stepped rotation, means, for mounting said last pair of gears in sealed relation in the casing including a compartment having an inlet in communication with said outlet and an outlet in communication with said reservoir, means for cooling the hydraulic fluid and prime mover including a fan driven by said prime mover.

8. A power unit for food mixers comprising a prime mover having a drive shaft, a transmission housing, a pair of meshed gears, means for mounting said gears in sealed relation in the housing including a compartment having an inlet opening and an outlet opening, meas for rotating the gears by the drive shaft, means in said transmission housing including a closed reservoir for supplying hydraulic fluid to said inlet, a pair of vertically disposed shafts Joumalled in said transmission housing and receiving food processing tools in detachable supported relation, a, pair of intermeshed gears for driving said shafts in 0D- posite and stepped rotation, means for mounting said last pair of gears in sealed relation in the housing including a compartment having an inlet in communication with said outlet and an outletin communication with said reservoir, some of saidshafts being exposed to receive tools exteriorly of the housing, and means for venting to the reservoir at points adjacent their centers, those of the above gears that are disposed'on 'exteriorly exposed 'sl'iafts,

9. A power unit for iood mixers comprising a prime mover, a transmission associated with said prime mover and having a fluid reservoir, an element defining a pump compartment, a pair of meshed gears mounted in the compartment, means for driving one of said gears by said prime mover, a casing defining a fluid motor compartment, a pair oi vertically disposed intermeshed gears in said fluid motor, a shaft driven by one of said gears, said casing having a socket in an outer portion into which a tool may be detachably,

received in driven relationship with the shaft,

-circuit means including a hydraulic medium by 'which hydraulic fluid under pressure is supplied said prime mover and'having a fluldyreservoir,

element defining a compartment, 8. pair inlet, a pair of vertically disposed shafts Jour oi meshed gears mounted in the compartment, means for driving one of said gearsby said prime mover. a casing deflning a fluid motor compartment, a pair of vertically disposed intermeshed gears in said fluid motor, a shaft driven by one or said gears. said casing having a socket in an outer portion into which a tool may be detachabLv received in driven relationship with the shaft, circuit means including a hydraulic medium by which hydraulic fluid under pressure is supplied to the motor compartment, said last pair of gears being'vertically spaced and the shaft driven by the upper of the pair of gears.

11. A power unit for a food mlxercolnprising a sheet metal shell, a fluid pump and casing therein brazed to said shell, means for securing a prime mover to said shell in mutually supported relationship with the shaft thereof received in said casing, a fluid motor casing secured to said shell and having a pair of intermeshed gears therein rotating a pair of shafts in opposite directions in stepped relation and so constructed and arranged as to receive food processing tools detachabiy therein, a supply of hydraulic fluid in said shell. means for cooling said fluid including an air propelling device driven by the prime mover, and means placing said casings and fluid supply in circuit with one another to transmit power developed in the pump casing to the gears in the motor casing.

12. A transmission comprising a sheet metal member deflning a reservoir for a hydraulic fluid, said member having a plurality of openings therein. a hydraulic positive displacement pump casing disposed in one of said openings and receiving through said opening-a shaft by which the pump is operated, a fluid motor casing disposed in another 01 said openings, a power drive shaft accessible through said opening and rotatably mounted in said motor casing, means connecting the casings and reservoir in circuit, said casings, member and said means being secured together as an integral assembly by brazing, said brazing flowing between associated elements to maintain clearance for the moving parts of the pump and motor, and means carried by said assembly for supporting a prime mover upon the assembly.

13. A power unit for a food mixer the combination of a shell, prime mover and integral transmission device, said device comprising a unitary homing having a plurality of compartments therein and a reservoir for storing hydraulic fluid, one of said compartments receiving fluid pumping elements therein, means secured to said device i'or supporting the prime mover in driving position for driving said pumping elements, a motor means driven by the fluid pumped by said elements for operating a food processing tool, means for coolingsaid prime mover and said hydraulic fluid including a propeller driven by said prime mover in the shell for conducting air from one to the other or said device and prime mover.

14. A power unit for food mixers comprising a drive, a transmission device including a reservoir for a hydraulic fluid, a pump for hydraulic fluid including a pair of meshed gears. means for mounting said gears in sealed relation in a pump housing including an element secured to said housing and providing a compartment having an inlet supplied by hydraulic fluid from the reservoir and an outlet opening, shaft means connected to said drive and extending through said element to engage one of th gears for rotating said gears to establish a hydraulic pressure at said outlet opening, means for relieving the shaft means to the pressure of the reservoir at a point intermediate the face of the gear and the point where said shaft means is exposed exteriorly of said element, a pair of horizontally disposed intermeshed gears, a pair of vertical shafts rotatably driven by said gears in stepped relation and so constructed and arranged as to receive food processing tools in detachable supported relation, means for driving said gears by said hydraulic fluid under pressure including a casing having a compartment sealing the gears and provided with an inlet upon one side of the said last pair of gears connected to said outlet, and an outlet to the reservoir upon the other ,side of said last air of gears.

15. In a food mixer having a prime mover, a transmission associated with said prime mover for driving food processing tools including a reservoir for hydraulic fluid, hydraulic pump means driven by said prime mover and having an inlet and an outlet for hydraulic fluid, hydraulic motor means having an inlet for hydraulic fluid connected to the outlet of said pump means by which hydraulic fluid under pressure is transmitted from the pump means to the motor means to drive the motor means, and conduit means interconnecting the motor means and the inlet of said pump means including said reservoir, said reservoir retaining a quantity of hydraulic fluid above the inlet of said pump means when the food mixer is in operation, a drive element driven by said motor means and exposed at one end to receive a detachable food processing tool in driven relation, and real means for returning to said conduit means hydraulic fluid escaping to the surface of said element between the motor and where said element is exposed to the outside.

16. In a food mixer having a prime mover, a transmission including a reservoir for hydraulic fluid, hydraulic pump means driven by said prime mover and having a fluid inlet and a fluid outlet, hydraulic motor means for driving two food processing tools including two intermeshed gears rotating in opposite directions for driving the tools in opposite directions about normally vertically disposed axes of rotation, said motor including a fluid inlet and a fluid outlet, conduit means interconnecting the inlet of the pump and the outlet of the motor, and second conduit means interconnecting the outlet of the pump and the inlet of the motor, one of said conduit means including communication with said reservoir.

VERNE C. KENNEDY. 

